lepton | file format for losslessly compressing JPEGs | Compression library

by dropbox C++ Version: 1.2 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | lepton Summary

lepton is a C++ library typically used in Utilities, Compression applications. lepton has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%. This can be used to archive large photo collections, or to serve images live and save 22% bandwidth.

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Quality

Security

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Support

lepton has a medium active ecosystem.

It has 5020 star(s) with 369 fork(s). There are 144 watchers for this library.

It had no major release in the last 12 months.

There are 22 open issues and 93 have been closed. On average issues are closed in 117 days. There are 5 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of lepton is 1.2

Quality

lepton has no bugs reported.

Security

lepton has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

lepton is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

lepton releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

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lepton Key Features

No Key Features are available at this moment for lepton.

lepton Examples and Code Snippets

No Code Snippets are available at this moment for lepton.

Community Discussions

Trending Discussions on lepton

How could I improve the runtime of this code?

Convert Output Thermal Camera to RGB in OpenCV

Use PutText to display temperature value on video stream

FLIR Lepton Thermal Camera & Python OpenCV

Rapsberry pi getting an 404 ERROR while upgrading

RE: Can OpenCV, Python3 Modules Handle SPI Devices as Cameras?

Wrong image colour when streaming from 16-bit depth webcam on Chrome OS

Custom Eslint rules in monorepo

member reference base type 'double [10]' is not a structure or union

Confusing use of sizeof(…) operator results

QUESTION

How could I improve the runtime of this code?

Asked 2021-May-27 at 16:50

I want to share some information betweeen two dataframes. My code works but takes a long time. Do you know how I could improve my runtime? I am trying to do the following:

I have a dataframe df1 (it has 160 columns, but only the ones shown are important here):

...

ANSWER

Answered 2021-May-27 at 08:56

The following snippet should run way faster thanks to its vectorized structure.

There are two tricks here. First one is to use df.melt which efficiently turns the columns a, b, ..., e into rows. Second one is to join the resulting DataFrame with df2. That way, all missing values become NaN and can be replaced with unknown with df.fillna.

Source https://stackoverflow.com/questions/67717949

QUESTION

Convert Output Thermal Camera to RGB in OpenCV

Asked 2021-May-19 at 06:21

I'm working on Lepton 2.5. thermal camera. When I run the code below, the output is on greyscale (attached image 1)..

Maybe somebody can help me to adjust this code so the output will be a RGB color (attached image 2). I really appreciate the assistance given. Sorry if I am not very competent in python or opencv, I try my best. Thank you

...

ANSWER

Answered 2021-May-19 at 06:21

Thanks to Peter Gibson You can find the answer on https://learnopencv.com/applycolormap-for-pseudocoloring-in-opencv-c-python/

you just have to take the latest image variable to show and redirect it into

Source https://stackoverflow.com/questions/67595832

QUESTION

Use PutText to display temperature value on video stream

Asked 2021-Apr-16 at 13:38

I'm using FLIR Lepton camera to capture the thermal image, then try to display the temperature on the image using PutText method but getting very strange result. Any advice is appreciated in advance.

Code:

...

ANSWER

Answered 2021-Apr-16 at 02:25

Have a look here:

Source https://stackoverflow.com/questions/67114125

QUESTION

FLIR Lepton Thermal Camera & Python OpenCV

Asked 2021-Apr-14 at 21:48

I'm trying to stream FLIR Lepton 3.5 with Python OPENCV using "VideoCapture" & "cv2.imshow" script. Then, I'll do some detection and control. Here's the problem I have, I was only able to get a very faint black/gray video stream with what seems to be a couple of rows of dead pixels at the bottom of the stream. This is expected since the output is supposed to be 16-Bit RAW image data. So,

I'm trying to convert to RGB888 image data so the stream has "colors".
Why is the stream video in static mode, it doesn't stream video like normal embedded notebook webcam?

I've tried the codes/scripts that were shared by others and even the example code from FLIR application notes, but didn't work. Your help is appreciated.

Environment: Windows 10, Python 3.7.6, PyCharm, OpenCV (latest), FLIR Lepton 3.5 camera/PureThermal2

Code:

...

ANSWER

Answered 2021-Apr-07 at 12:26

It's challenging to give an answer without having the camera.
Please note that I could not verify my solution.

I found the following issues with your code:

rval, frame = video.read() must be inside the while loop.
The code grabs the next frame.
If you want to grab more than one frame, you should execute it in a loop.
normed = cv2.normalize(frame, None, 0, 65535, cv2.NORM_MINMAX)
Returns uint16 values in range [0, 65535].
You are getting an overflow when converting to uint8 by np.uint8(normed).
I recommend normalizing to range [0, 255].
You may also select the type of the result to be uint8:

Source https://stackoverflow.com/questions/66909370

QUESTION

Rapsberry pi getting an 404 ERROR while upgrading

Asked 2021-Apr-07 at 12:59

I tried to install the FLIR Lepton library on Raspberry Pi zero w but as i was theFLIR Lepton (sudo apt-get install qt4-dev-tools)in pi this error message show up

...

ANSWER

Answered 2021-Mar-23 at 17:01

1 . Erase the sdcard you are using (if it is not carrying some data you don't want to lose) 2. Download a previous version of pios or upgrade the current one

Source https://stackoverflow.com/questions/66767473

QUESTION

RE: Can OpenCV, Python3 Modules Handle SPI Devices as Cameras?

Asked 2021-Feb-24 at 11:40

I am working from these examples online: https://docs.opencv.org/3.4/dd/d43/tutorial_py_video_display.html

I am using a pylepton library in Python also that is located here: https://github.com/groupgets/pylepton. Neither are related but...

Does using OpenCV only stay dedicated to USB Cameras in general?
And...
Can OpenCV understand that I am using a '/dev/spidevX.X' device as a camera?

For instance, I have tried replacing '0' with a '/dev/spidev1.0' device like here...

...

ANSWER

Answered 2021-Feb-24 at 11:40

OpenCV is not designed to directly capture from SPI, therefore your code will not work easily. Nevertheless, if you look into capturing a video, try capturing the images and with pylepton and then writing it to a videofile with openCV

Source https://stackoverflow.com/questions/66182660

QUESTION

Wrong image colour when streaming from 16-bit depth webcam on Chrome OS

Asked 2020-Oct-09 at 17:54

I want to display the video stream from a USB thermal camera - for the record, it's a FLIR Lepton PureThermal 2 - on my web app, running on a Chrome OS (version 85.0.4183.84 - latest available).

At first I assumed the device could be streamed as a standard webcam, so I came up with the following code:

...

ANSWER

Answered 2020-Sep-08 at 22:35

I managed to make it work on Chrome OS by doing the following:

As soon as the video starts playing, save the bytes from the current frame into a texture buffer (with the help of WebGL)
For every pixel in the frame, multiply the red channel by 65535, returning the temperature in centikelvin
Convert it to celsius and manipulate the pixels to show a grey scale image within a temperature range
Draw the pixel on a canvas
Request a new frame (restarting the loop)

See sample code here: https://codesandbox.io/s/upbeat-wood-umo9w?file=/index.html

Result:

Special thanks to Aleksandar Stojiljkovic and Kurt Kiefer.

The same result could be achieved by applying a custom shader to the texture instead.

I'm still not sure why Chrome OS handles the video differently, so I've raised an issue on Chromium issue tracker anyway.

Source https://stackoverflow.com/questions/63663370

QUESTION

Custom Eslint rules in monorepo

Asked 2019-Dec-04 at 06:04

I have a monorepo with a server and frontend. I want to incorporate a set of custom eslint rules into the frontend component of my repo. I cannot find a way to tell eslint that there are custom rules in a specific folder within my frontend directory. I don't want to create a new external repo and publish this in order to import the rules. So far I think the way to do what I want is to create a sub-package within the main repo (with its own package.json).

In my root package.json I have "eslint-plugin-atlas": "file:./src/main/javascript/build/eslint",

In my root .eslintrc I have "plugin:atlas/recommended"

In the directory specified in package.json, in an index.js, I have the below code;

...

ANSWER

Answered 2019-Sep-30 at 16:24

Not a solution built into eslint, but this can be done with the following eslint plugin;

npmjs.com/eslint-plugin-rulesdir

Source https://stackoverflow.com/questions/58167801

QUESTION

member reference base type 'double [10]' is not a structure or union

Asked 2019-Oct-03 at 09:01

I created a fixed array e_pt[10] initialised with zeros. I then filled in some values into the array e_pt. I would then like to find the index of the largest element in the array. The code is shown below.

...

ANSWER

Answered 2019-Oct-03 at 09:01

std::max_element(e_pt.begin(), e_pt.end()) Native array doesn't have methods like that.

It should be

Source https://stackoverflow.com/questions/58215536

QUESTION

Confusing use of sizeof(…) operator results

Asked 2019-May-15 at 17:22

I was browsing some C++ code recently and I ran into the following line:

...

ANSWER

Answered 2017-Feb-04 at 19:06

In C++, the sizeof operator has a form sizeof expression in addition to the more common sizeof(type), so this:

Source https://stackoverflow.com/questions/42036757

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install lepton

Using a single core.

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